Question

K2O+H2O=KOH
What,if anything, should be done to balance this chemical equation?

Answer 1

As is, the equation has:

Reactants:
2 K
2 O
2 H

Products:
1 K
1 O
1 H

So, we can add coefficients to balance the equation:
K2O + H2O = 2KOH

The coefficient means that there are 2 moles of KOH, and now the equation is balanced as there is 2 of everything on both sides.